SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Dail Baljit

(Last)

(First)

(Middle)

AON CORPORATION - CORPORATE LAW DEPT

200 EAST RANDOLPH STREET, 8TH FLOOR

(Street)

CHICAGO

60601

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
04/01/2008

3. Issuer Name and Ticker or Trading Symbol
AON CORP [ AOC ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
CIO, ACW - CEO

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	910	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Restricted Stock Unit Award (Right to Receive)	^{( 1 )}	11/17/2010	Common Stock	10,000	^{( 2 )}	D
Restricted Stock Unit Award (Right to Receive)	^{( 3 )} ^{( 4 )}	03/15/2010	Common Stock	5,257	^{( 2 )}	D
Restricted Stock Unit Award (Right to Receive)	^{( 3 )} ^{( 5 )}	03/16/2009	Common Stock	547	^{( 2 )}	D
Employee Stock Option (Right to Buy)	^{( 6 )}	11/17/2015	Common Stock	20,000	36.76	D
Employee Stock Option (Right to Buy)	^{( 7 )} ^{( 8 )}	03/16/2012	Common Stock	12,744	41.195	D
Employee Stock Option (Right to Buy)	^{( 7 )} ^{( 9 )}	03/15/2013	Common Stock	20,216	37.1	D
Employee Stock Option (Right to Buy)	^{( 7 )} ^{( 10 )}	03/13/2014	Common Stock	22,000	40.91	D

Explanation of Responses:

1. Awards granted pursuant to the Aon Stock Incentive Plan that will vest as follows: one-third of the awards will vest on each of the third through fifth anniversaries of the date of grant. The date of grant was November 17, 2005.

2. The restricted stock unit award converts to shares of common stock on a 1-for-1 basis.

3. Awards granted pursuant to the Aon Stock Incentive Plan that will vest as follows: 22.22% of the awards will vest on each of the first and second anniversaries of the date of grant, and 55.56% of the awards will vest on the third anniversary of the date of grant.

4. The date of grant was March 15, 2007, and the amount of the initial grant was 5,257 shares, 1,169 of which have previously vested.

5. The date of grant was March 16, 2006, and the amount of the initial grant was 547 shares, 244 of which have previously vested.

6. Options granted pursuant to the Aon Stock Incentive Plan that will vest as follows: one-third of the options will vest on each of the second through fourth anniversaries of the date of grant. The date of grant was November 17, 2005.

7. Options granted pursuant to the Aon Stock Incentive Plan that will vest as follows: one-third of the options will vest on each of the first through third anniversaries of the date of grant.

8. The date of grant was March 16, 2006.

9. The date of grant was March 15, 2007.

10. The date of grant was March 13, 2008.

	/s/ Jennifer L. Kraft - by Jennifer L. Kraft pursuant to a power of attorney from Baljit Dail	04/11/2008
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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